# 导入模块
from bs4 import BeautifulSoup

# 创建对象
soup = BeautifulSoup('<html>data</html>', features='lxml')  # 指明解析器lxml
print(soup)

# 准备文档字符串
html = '''<html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible 
content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css 
href=http://s1.bdstatic.com/r/www/cache/bdorz/baidu.min.css><title>百度一下，你就知道</title></head> <body link=#0000cc> <div 
id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img 
hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f 
action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie 
value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden 
name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd 
class=s_ipt value maxlength=255 autocomplete=off autofocus></span><span class="bg s_btn_wr"><input type=submit id=su 
value=百度一下 class="bg s_btn"></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews 
class=mnav>新闻</a> <a href=http://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com 
name=tj_trmap class=mnav>地图</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>视频</a> <a 
href=http://tieba.baidu.com name=tj_trtieba class=mnav>贴吧</a> <noscript> <a 
href=http://www.baidu.com/bdorz/login.gif?login&amp;tpl=mn&amp;u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 
name=tj_login class=lb>登录</a> </noscript> <script>document.write('<a 
href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (
window.location.search === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登录</a>');</script> <a 
href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多产品</a> </div> </div> </div> <div 
id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>关于百度</a> <a href=http://ir.baidu.com>About 
Baidu</a> </p> <p id=cp>&copy;2017&nbsp;Baidu&nbsp;<a href=http://www.baidu.com/duty/>使用百度前必读</a>&nbsp; <a 
href=http://jianyi.baidu.com/ class=cp-feedback>意见反馈</a>&nbsp;京ICP证030173号&nbsp; <img src=//www.baidu.com/img/gs.gif> 
</p> </div> </div> </div> </body> </html>'''

soup = BeautifulSoup(html, 'lxml')

# 单个查找 标签查找
# 查找返回的是Tag对象
title = soup.find('title')
print(title)
a = soup.find('a')
print(a)

# 查找全部 标签查找
a_list = soup.find_all('a')
print(a_list)

# 根据命名参数查找
id_lh = soup.find(id='lh')
print(id_lh)

# 指定属性字典查找
attrs_lh = soup.find(attrs={'id': 'lh'})
attrs_lb = soup.find(attrs={'class': 'mnav', 'name': 'tj_trnews'})
print(attrs_lh)
print(attrs_lb)

# 根据文本查找
login = soup.find(string='登录')
print(login)

print(type(login))

# Tag对象
print(type(a))
print(f"标签名是{a.name}")
print(f"标签的所有属性是{a.attrs}")
print(f"标签的文本是{a.string}")
